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A closed conical tank cover (with a circular base sheet) has radius 7 m and slant height 12.5 m. How much sheet is needed in all? (π = $\frac{22}{7}$ )

Class 9Surface Area of a ConeMensuration

A $583 m^{2}$
B $275 m^{2}$
C $154 m^{2}$
D $429 m^{2}$

Step-by-Step Solution

TSA =

\frac{22}{7} \times 7 \times (12.5 + 7) = 22 \times 19.5 = 429 m^{2} . (275 m^{2}

is only the curved part.)

Answer: D)

429 m^{2}

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